She
rocked a voluminous dirty blonde wig, which she swapped for a platinum
blonde bob when wearing the octopus outfit, complete with a pair of
giant tentacles protruding from her forehead.

Gaga
was also pictured in a gold jewel encrusted long-sleeved leotard
featuring a giant pearl-like ornament front and centre, with gold wings
protruding from her back.

Edgy: The 28-year-old pop star sported a tentacle laden costume reminiscent of an octopus, complete with a pair of giant tentacles protruding from her forehead

Golden girl: Gaga was also pictured in a gold jewel encrusted long-sleeved leotard featuring a giant pearl-like ornament front and centre, with gold wings protruding from her back

Sparkling: She also sported a white rhinestone encrusted jacket top with matching bottoms

She also sported a white rhinestone encrusted jacket top with a matching skirt, as she rocked out on a sea horse piano.

The
Alejandro hitmaker went a little more risqué in a wacky graffiti print
skirt and a transparent top with pink bands and colourful duct tape protecting her modesty.

She performed on day three of the Ottawa Bluesfest, which is stretching from Thursday, July 3 to Sunday, July 13.

Instrument: The Applause hitmaker rocked out on a sea horse piano

Risque: The NYC native donned a wacky graffiti print skirt and a transparent top with pink bands and colourful duct tape protecting her modesty

Wacky: She sported a wig featuring multicoloured dread locks

Gaga
was featured at the annual outdoor music festival alongside the likes
of Blake Shelton, Tegan and Sara, Journey, Lady Antebellum, and Tokyo
Police Club.

She
is currently embarked upon the North American leg of her ArtRAVE: The
ARTPOP Ball world tour, and will next head to Buffalo, New York for a
performance on Monday.

The
Monster singer Instagrammed an image of her backside dressed in a thong
on Saturday, with the caption, ‘#artRaveOttawa LETS GO MONSTERS Be
proud, we've come so far together. Everyone deserves a shot. Tonight is
ours!’

The Alejandro hitmaker tweeted afterward: '27,000 fans showed up to the artRave at Bluesfest in Ottawa last night. Seeing all those bodies slamming against each other cheering'

Sleek: She changed into a glossy black leotard and sang passionately into a rhinestone encrusted microphone

Jet-setting: Gaga is currently embarked upon the North American leg of her ArtRAVE: The ARTPOP Ball world tour, and will next head to Buffalo, New York for a performance on Monday

She
added on Twitter: ‘I'm So excited to perform in Ottawa tonight. ANOTHER
AMAZING FESTIVAL, can't wait to see all my amazing fans.’

After
the show, Gaga tweeted: ‘27,000 fans showed up to the artRave at
Bluesfest in Ottawa last night. Seeing all those bodies slamming against
each other cheering’

And
on Sunday, the New York City native treated herself, bragging to her
41.6 million followers on Twitter: ‘JUST HAD THE GREATEST SHOPPING
EXPERIENCE OF ALL TIME IT WAS LIKE CARDIO AND DRUGS BUT BETTER MAYBE NOT
HEALTHY BUT THE VINTAGE WAS’.

Yummy creation: She Instagrammed this photo on Sunday, writing, 'I love the cake this hotel made me. Luck be a Lady.'

Classic character: Gaga channeled Arial from the Little Mermaid in her under the sea themed performance

Evil: Gaga also brought to life Little Mermaid villain Ursula in her octopus costume